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Frequency Sweeping Phase/Amplitude Test Set

Publishing Venue

IBM

Related People

Comninos, R: AUTHOR

Abstract

The frequency-sweeping phase/amplitude test set 10 provides precision measurements of phase tracking to be performed on multichannel superheterodyne receivers, e.g., receiver 14, on a frequency-swept basis.

Country

United States

Language

English (United States)

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Frequency Sweeping Phase/Amplitude Test Set

The frequency-sweeping phase/amplitude test set 10 provides precision
measurements of phase tracking to be performed on multichannel
superheterodyne receivers, e.g., receiver 14, on a frequency-swept basis.

The test data (phase difference vs. frequency) is produced as hard copy
chart by recorder 11. The data can be used for exploratory testing of receivers or
antenna-receiver combinations, and also for production testing for specification
conformance. Amplitude versus frequency data is also produced. Frequency
coverage may be as broad as that associated with the signal generator and the
receiver under test. Time for testing is greatly reduced compared to manual spot
frequency checks. The test set consists of commercially available standard
laboratory equipment and devices. Lock circuitry 12 integrates and controls the
overall operation.

In operation, sweep signal generator 13 provides the local oscillator range for
the receiver 14 under test via a two-way power divider 15. The sweep signal
generator is also routed via the two-way divider to an up converter 16. The up
converter also receives an input at the receiver IF frequency from IF generator 17. The up converter 16 primarily produces an output at local output (LO)
frequency and side bands LO +/- IF. These output frequencies are amplified by
amplifier 18 and fed to YIG filter 19, Which filters out the desired side hand (LO +
IF) or (LO - IF).

Filter 19 is tuned to the desired side band by lock circuitry 12 and offset
power supply 20.